Vehicle HVAC Intake Layout for Full Cabin-Air Filter Use
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Solution Overview
Problem
The existing vehicular air conditioning systems face difficulties in introducing indoor air when the intake unit is installed on the side of the engine room, leading to reduced air conditioning efficiency and unused portions of the air filter, resulting in dead areas and compromised ventilation.
Innovation Solution
The system incorporates an auxiliary indoor air introduction part with a flap-type auxiliary indoor air door installed on a partition wall, which opens to introduce indoor air to the air filter even when the intake unit is on the engine side, utilizing differential pressure to facilitate air flow and ensuring the entire air filter is utilized without dead areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the intake unit is installed on the side of the engine room, then the air conditioning system can be compactly arranged, but the auxiliary indoor air introduction part cannot effectively introduce indoor air to the air filter
Solution Approach 1:
The auxiliary indoor air introduction part is installed on the partition wall between the engine room and passenger compartment, utilizing the vertical/directional dimension to introduce indoor air from a different spatial orientation. This allows the system to maintain compact engine room installation while still accessing indoor air through the partition wall structure.
Solution Approach 2:
The partition wall serves as an intermediary structure that facilitates indoor air introduction. By installing the auxiliary indoor air introduction part on the partition wall, the system uses this intermediate structure to bridge the gap between the engine room location and the air filter, enabling indirect but effective air introduction.
2Device complexity
If the auxiliary indoor air introduction part is not used, then the structure is simpler, but portions of the air filter remain unused creating dead areas
Solution Approach 1:
The air filter is effectively divided into multiple functional zones: the main air inlet and the auxiliary indoor air introduction part. This segmentation allows different portions of the air filter to serve specific purposes, ensuring complete utilization of the air filter surface area and eliminating dead zones while maintaining reasonable structural complexity.
3Ease of operation
If the auxiliary outdoor air inlet is completely closed, then outdoor air introduction is controlled, but the air filter portion corresponding to the auxiliary inlet becomes a dead area
Solution Approach 1:
The auxiliary indoor air introduction part provides multi-functionality to the air introduction system. It can introduce indoor air to the air filter regardless of the outdoor air inlet status, ensuring that the air filter remains fully utilized in various operating conditions (outdoor air mode, indoor air mode, or mixed mode) without creating dead areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances air conditioning efficiency in the passenger compartment by allowing indoor air introduction to the air filter, regardless of the intake unit's installation position, and enables the common use of components across different vehicle models, reducing costs and improving ventilation.
Implementation Method 1
utilizing differential pressure to facilitate air flow
Data Source
AI summary
A vehicular air conditioning system includes an intake unit configured to inhale an indoor air and an outdoor air. The intake unit includes an outdoor air inlet configured to introduce the outdoor air, an indoor air inlet configured to introduce the indoor air and a plurality of doors configured to selectively open the outdoor air inlet and the indoor air inlet. The intake unit further includes an auxiliary indoor air introduction part configured to introduce the indoor air. The auxiliary indoor air introduction part is configured to introduce a part of the indoor air existing on the side of the indoor air inlet.